Sorry; I can't put my finger on exactly why but for some reason that character really grinds my gears.
I hope Lupin Blue gets given more to do than Garu did, though he seems like the most obvious of the Lupins to fall through the cracks seeing as Red is...a Red, and Yellow is a relatively big name actor.
I thought he was a bad actor as well, so that could be why you didn't like him? In combination with his condescending approach at "cool blue" it was a recipe for disaster. He was such an artificially made character type.